[1] Univ Wales Swansea, Dept Child Hlth, Swansea SA2 8QA, W Glam, Wales
[2] Fdn Genet & Rare Dis, Tbilisi, Georgia
[3] Hop Trousseau, Serv Hemato Oncol Pediat, F-75571 Paris, France
[4] Maccabi Hlth Serv, Dept Pediat, Tel Aviv, Israel
[5] Hosp Clin Univ Lozano Blesa, Zaragoza, Spain
[6] Univ Milano Bicocca, Milan, Italy
[7] Youth Healthcare, Meppel, Netherlands
[8] PA Kyriakou Childrens Hosp, Dept Paediat Nephrol, Athens, Greece
[9] Univ Childrens Hosp, Dept Paediat Nephrol, Skopje, Macedonia
[10] Vilnius Univ, Fac Med, Dept Paediat, Vilnius, Lithuania
[11] Gdansk Med Univ, Dept Paediat, Gdansk, Poland